The Copy Is Foggy Horizontally; The Copy Has Poor Sharpness - Canon iR8500 Service Manual

CHAPTER 6 TROUBLESHOOTING

3.3.19 The copy is foggy horizontally

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1) In Direct copy mode, does the problem occur at the same location
YES: Go to step 3).
Scanning lamp, Lamp regulator
2) While the scanner is moving forward, does the scanning lamp
YES: Check the scanning lamp and the lamp regulator.
Scanner (wobbling), Feeding assembly (wobbling)
3) Make a reduced copy, and compare it against a Direct copy. Is the
NO:
YES: Check the feeding system.

3.3.20 The copy has poor sharpness

Copyboard glass
1) Is there oil or the like on the copyboard glass?
YES: Clean the copyboard glass.
Mirror (position)
2) Is the horizontal reproduction ratio of Direct copies as indicated?
NO:
Scanner (dirt)
3) Clean the scanning lamp, reflecting plate, mirror, lens, and dust-
YES: End.
Photosensitive drum, Lens drive assembly
4) Try replacing the photosensitive drum. Is the problem corrected?
YES: End.
NO:
6-90
at all times?
flicker?
problem at different locations?
Check the scanner.
Adjust the distance between No. 1 mirror and No. 2 mirror.
proofing glass. Is the problem corrected?
Check the lens drive assembly for movement.
COPYRIGHT© 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001